Orchestration Engine Error

Hello Gurus. I’m having a problem with my orchestration suspending. I have searched the web high and low for answers but I haven’t been able to resolve. I have an expression near the end of my orchestration where I access a file path using System.Configuration.ConfigurationSettings.AppSettings. The orchestration has been running fine until today when I got a suspended message. The error is below:

Uncaught exception (see the ‘inner exception’ below) has suspended an instance of service ‘XXXX’.
The service instance will remain suspended until administratively resumed or terminated.
If resumed the instance will continue from its last persisted state and may re-throw the same unexpected exception.
InstanceId:
Shape name: RunFile
ShapeId:
Exception thrown from: segment 2, progress 9
Inner exception: Access to the path ‘\\XXXX\’ is denied

When I open the message parts, I can see the Originator Security ID is incorrect. It is using a user network account that is disabled. I am not quite sure how and why it is using this account, the Host Instance is using a domain account and shouldn’t this account be used as the Originator Security ID for all messages??

Thanks for your help.